Influencing total acidity in grapevines
A certain level of acidity is considered important to the taste of any wine. This can be influenced by crop nutrition
A certain level of acidity is considered important to the taste of any wine. Wine grape acidity gives the wine its fresh, crisp taste. Thus, along with sugar, the titratable or total acidity of the grape juice, is an important guide to wine quality.
Two acids - malic and tartaric – account for over 90% of the total acidity TA (organic acids) in grapes. They are measured by titration and typical values are 0-10g/l and 2-5g/l respectively in the wine.
The aromatic components, which form part of the titratable acids, play a large role in the sensory or organoleptic quality of the finished wine. Within any wine there are usually over 500 of these substances, all of which are found in minute quantities.
Crop nutrition and titratable or total acidity in wine grape
Potassium
Crop nutrition is very important for the formation of malic and tartaric acids. Potassium applications serve to increase the malate and potassium concentration in berries.
Boron and Zinc
Boron and zinc reduce acidity.
Recommended Yara fertilisers for grapevines
How nutrient management affects wine grape
Influencing grapevine yield
High grapevine yields are obtained on the most freely drained soils where water is not limiting. Vines will grow across a wide range of soil pHs, but extremes will render many nutrients unavailable and thereby restrict yield.
Increasing grape berry set and weight
Nitrogen and phosphorus are significant in increasing wine grape berry set and weight.
Improving grape quality
The aim of any grower is a high yielding, top quality wine grape that satisfies the wine-maker. Both yield and quality are strongly influenced by nutrition.
Influencing grape and wine pH
Strong vine canopies can lead to excessive nitrogen and potassium uptake, which increases grape and wine pH.
Grape nutrient deficiencies
Identify and diagnose if your grapes are suffering from nutrient deficiencies and learn more about the symptoms and causes and how to control or correct the deficiency
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